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  • DuroMax XP12000HX
  • Generac #7705 GP15500EFI
  • Model XP12000HX
    Model XP12000HX

    DuroMax 9,500W Dual-Fuel Generator

    9500W
    Running
    74 dB
    Noise
    View details
  • Model #7705 GP15500EFI
    Model #7705 GP15500EFI

    Generac 15,500W Gas Generator

    15500W
    Running
    0 dB
    Noise
    View details
Quick charts
Each chart uses its own Y-axis scale (so numbers are comparable within a chart).
Running watts
W
Starting watts
W
Noise
dB
Runtime @50%
h
Running watts by fuel
Shows how output changes across gasoline/propane/natural gas (when available).
Generator Specifications Comparison
SpecificationDuroMax XP12000HXGenerac #7705 GP15500EFI
General
Product type
Generator
Generator
Fuel
Dual-Fuel
Gasoline
InverterNoNo
Parallel capableNoNo
RV readyYesYes
Running watts
9500 W
Winner: Winner: 15500 W
Starting watts
12000 W
Winner: Winner: 19300 W
Noise (lower limit)
Winner: Winner: 74 dB
0 dB
Weight
Winner: Winner: 230 lbs
420 lbs
Run time @50% load
9 h
Winner: Winner: 11 h
Run time @25% load
19 h
Not available
Fuel tank
8.3 gal
14.2 gal
Fuel gaugeYesYes
Approx. dimensions (L × W × H)
29 x 30 x 26
58.5 x 30.9 x 36.5
Electrical
Voltage (AC)
120/240
120/240
Voltage (DC)
Not available
Not available
GFCI outletsYesYes
Covered outletsNoYes
Automatic Voltage RegulationYesYes
THD
Not available
<5% %
Engine
Engine
457 cc OHV 4-stroke, cast iron sleeve
Generac G-Force OVHI 4-stroke
Alternator
Not available
Not available
Starting system
Recoil, Electric
Electric
Warranty
Warranty
5 years
3 years
Power by fuel
GasolineNot availableNot available
Running watts
9500 W
15500 W
Starting watts
12000 W
19300 W
Running amps (120V)
Not available
Not available
Running amps (240V)
Not available
Not available
Peak amps (120V)
Not available
Not available
Peak amps (240V)
Not available
Not available
Run time @50% load
9 h
11 h
Run time @25% load
19 h
Not available
PropaneNot availableNot available
Running watts
9025 W
Not available
Starting watts
11400 W
Not available
Running amps (120V)
Not available
Not available
Running amps (240V)
Not available
Not available
Peak amps (120V)
Not available
Not available
Peak amps (240V)
Not available
Not available
Run time @50% load
3.5 h
Not available
Run time @25% load
7 h
Not available
Other
Data center
Not available
Not available
Indicators
true
false
Compliance
CARB, EPA
EPA
Security
Not available
Not available
Spark arrestorYesYes
Neutral
Not available
true
UPC
811640016227
696471083705
Core / High-priority specs
Running Watts (Gasoline)
9500
15500
Running Watts (Propane)
9025
Not available
Starting Watts (Gasoline)
12000
19300
Starting Watts (Propane)
11400
Not available
Runtime @ 50% Load (Gasoline)
9
11
Runtime @ 50% Load (Propane)
3.5
Not available
Runtime @ 25% Load (Gasoline)
19
Not available
Runtime @ 25% Load (Propane)
7
Not available
AC Outlet Types
2x Duplex 120V 20A (5-20R); 1x 120V 30A (L5-30R); 1x 120/240V 30A (L14-30R); 1x 120/240V 50A (14-50R)
2x Duplex 120V 20A (5-20R) GFCI; 1x 120V 30A (L5-30R); 1x 120/240V 30A (L14-30R); 1x 120/240V 50A (14-50R)
Electrical & power
Frequency
60
60
Engine & construction
Engine Type
OHV 4-stroke
G-Force OVHI 4-stroke
Engine Displacement
457
816
Cylinder Sleeve
Cast iron sleeve
Not available
Alternator Winding Material
Copper windings
Not available
Engine Oil Type
Not available
10W-30 / SAE 30
Runtime & fuel system
Runtime @ 25% Load (Gasoline)
19
Not available
Runtime @ 50% Load (Gasoline)
9
11
Runtime @ 50% Load (Propane)
3.5
Not available
Safety & compliance
Overload Protection System
Low oil and overload protection
Low oil and overload protection, CO monitoring
Low Oil ProtectionYesYes
Carbon Monoxide MonitoringYesYes
Included equipment
Starting Components
Recoil, Electric
Not available
Included Accessories
Funnel, tool kit, propane hose, battery, and wheel kit
Oil, battery, and wheel kit
Warranty & identification
Residential Warranty
5
Not available
Commercial Warranty
5
3
Additional specs
Summary
The DuroMax XP12000HX is a 9,500-watt dual-fuel generator built for job sites, home backup, and RV use. Its 12,000-watt peak capacity handles the startup surge of air conditioners, compressors, and welders, while the 9,500-watt running output sustains multiple heavy tools or household circuits simultaneously. Gasoline delivers 19 hours of runtime at quarter load, making this unit suitable for extended outages or multi-day events without constant refueling. The dual-fuel design means users can switch between gasoline and propane depending on fuel availability and storage constraints. On propane at 25% load, runtime drops to 7 hours, trading endurance for cleaner emissions and longer shelf life. The 457 cc cast iron engine is built for durability on job sites where generators take abuse. This is a stationary workhorse, not a portable grab-and-go unit.
The Generac #7705 GP15500EFI is a 15,500-watt gasoline generator built for whole-house backup and RV power. Electronic Fuel Injection adjusts fuel delivery based on load, meaning the engine burns only what it needs rather than running at a fixed rate. At this wattage, it can run central air conditioning, a well pump, kitchen appliances, and multiple lighting circuits simultaneously, functioning as a realistic alternative to a permanently installed standby system without the installation cost or natural gas hookup.
  • Most Powerful
    Generac #7705 GP15500EFI
    15500W running
  • Quietest
    DuroMax XP12000HX
    74 dB
  • Longest Runtime
    Generac #7705 GP15500EFI
    11h at 50% load
Where to buy
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DuroMax XP12000HX
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Generac #7705 GP15500EFI
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